Ключевые слова: aerial, aerial photography, aerial survey, ancient, architecture, autumn, building, buildings, cathedral, christianity, church, city, cloudy, day, europe, finland, historical, historical center, house, landmark, landscape, lutheran, northern europe, october, old, old town, outdoor, outdoors, porvoo, porvoonjoki, religion, river, scandinavia, streets, sunny, temple, top view, tourism, town, travel, urban, view, waterfront, wooden,